There's a new Steam Beta client available. To access the Beta, go to File -> Settings. On the Account tab press the Change... button to open the Beta Participation dialog. Then Select "Steam Beta Update", and allow Steam to restart itself. Here are the specific changes:

3/06/2012
- Added ability to set homepage for overlay web browser via settings dialog.
- Fixed arrow keys and home/end not changing the scrollbar in the html control when pressed.
- Fixed crash when pinging servers.
- Added support for Unicode entry to the new friends filter.

3/08/2012 PM
- Fixed client hang when launching games or starting/pausing game downloads.
- Added support for "about:blank" for the Overlay Web Browser home page.
- Fixed the Web Browser button in the overlay sometimes not bringing up a new browser.
- Fixed cases where "Error 16" would be displayed when downloading some Skyrim Workshop files
- Fixed javascript confirm dialogs not displaying properly in the HTML control.